Headboard



FIG. 1 is front perspective view of the headboard showing my new design;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a plan view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a right side view thereof, the left side being a mirror image thereof; and,

FIG. 6 is a rear view thereof.

The broken lines in the drawings depict portions of the article that form no part of the claimed design. 

CLAIM The ornamental design for a headboard, as shown and described. 